From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [SCM] guix source archive branch, master,
	updated. v0.1-234-g0206513
Date: Thu, 07 Mar 2013 14:55:16 +0100
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References: <E1UDLYG-0004ar-JJ@vcs.savannah.gnu.org> <87boaw9jpd.fsf@gnu.org>
	<87boaw5agn.fsf@karetnikov.org>
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In-Reply-To: <87boaw5agn.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Thu, 07 Mar 2013 04:18:16 +0400")
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: bug-guix@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

>> Such changes should be done in =E2=80=98core-updates=E2=80=99, not =E2=
=80=98master=E2=80=99, because
>> they entail a full rebuild.
>
> Oh, I'm sorry.  But could you explain why?  I'm puzzled because the
> commit doesn't remove anything.

guix/build/utils.scm is used by every build script; same for
gnu/build/gnu-build-system.scm.  So if you change something there,
everything has to be rebuilt.

The purpose of =E2=80=98core-updates=E2=80=99 is to have a staging area for=
 changes that
require full rebuilds, so that users don=E2=80=99t end up rebuild everything
every other day.  ;-)

> Could you provide a list of files that shouldn't be changed in 'master'?
> I guess that 'gnu/packages/base.scm', 'gnu/packages/make-bootstrap.scm',
> and 'guix/build' shouldn't be touched.  Anything else?

make-bootstrap.scm can actually be changed at will.  base.scm can be
changed too, as long as the derivations it defines remain unchanged (for
instance, you can add comments, change =E2=80=98hello=E2=80=99, but not gli=
bc.)

If in doubt, try =E2=80=98guix build coreutils -n=E2=80=99 after making you=
r change to
see if it entails a full rebuild.

Ludo=E2=80=99.